The M203 and M320 mentioned here are both single-shot 40x46mm grenade launchers, which the Army primarily fields as under-barrel attachments for existing M16/M4-series guns.

The M320 Grenade Launcher is a modern, versatile 40mm weapon with enhanced accuracy, safety, and flexibility for military operations. Maddow Blog | Pressed on Gabbard’s Iran assessment, Trump ...

The army's xTechSoldier Lethality has been awarding companies cash prizes for their solutions to replace legacy M320 grenade launchers.

The OICW inspired the M320 grenade launcher and the XM25 air-burst munitions system. The U.S. Army’s Objective Individual Combat Weapon program launched in December 1993.

The U.S. Army Thought This Rifle Was the Future (It Was a Mistake) The effort wasn’t a total waste, however. The OICW inspired the M320 grenade launcher and the XM25 air-burst munitions system.

The M320 is an improved version of the M203 that can be attached to the rifle or fired as a standalone weapon system, said Sgt. 1st Class Benjamin H. Patterson, a platoon sergeant with Company C.